Learn how PCB cleaning machines remove dust, flux residue and ionic contamination, and compare dry, brush, batch and inline cleaning equipment.
ByadminA PCB cleaning machine removes defined contamination from printed circuit boards during electronics manufacturing. Depending on the production stage, it may clean dust from bare PCBs before solder paste printing or remove flux residue, loose solder balls and other process contamination from assembled PCBAs after soldering.
In global equipment sourcing, PCB cleaning machine is commonly used as a broad purchasing term. Buyers may use it when searching for bare-board cleaners, PCBA brush cleaners, batch washers or inline aqueous cleaning systems. The equipment must therefore be selected according to the actual board, contamination and production process rather than the search term alone.
DEZ separates these applications into two equipment categories:
The important distinction is the condition of the board when it enters the machine.
A PCB is the printed circuit board before components are assembled. At this stage, the main cleaning requirement is normally the removal of dust, fibres, hair, loose particles and static-attracted contamination before solder paste printing.
A PCBA is a printed circuit board assembly containing components and solder joints. Cleaning after assembly may target visible flux residue, ionic contamination, fingerprints, cleaning-agent residue, solder balls or other manufacturing contamination.
Both may be described as circuit-board cleaning in purchasing enquiries. However, they require different cleaning mechanisms.
| Production condition | Main problem | Required process |
|---|---|---|
| Bare PCB before solder paste printing | Dust, fibres and loose particles on the board surface | Dry double-sided surface cleaning |
| Assembled PCBA after wave or selective soldering | Visible flux marks and loose solder balls on an accessible solder side | Single-sided brush cleaning |
| Mixed PCBA models after soldering | Flux residue requiring washing, rinsing and drying | Offline batch aqueous cleaning |
| Continuous PCBA production | Repeated washing, DI-water rinsing and drying | Inline aqueous cleaning |
| PCBA before conformal coating | Surface contamination that may affect coating application | Validated wash, rinse and drying process |
A dry PCB surface cleaner cannot replace a post-solder PCBA washing machine. A brush cleaner also cannot reach every area beneath components or inside narrow gaps. The machine must match the location and type of contamination.
Bare PCBs can collect dust, fibres and packaging debris during storage, unpacking, handling and loading. Static charge can attract additional particles before the board reaches the printer.
A dry PCB surface cleaning machine is installed after the PCB loader and before the solder paste printer:
PCB Loader → PCB Cleaning Machine → Solder Paste Printer → SPI → Pick-and-Place → Reflow Oven
The cleaning system loosens particles, reduces static attraction and collects contamination rather than simply moving it to another part of the production area.
Wave and selective soldering can leave visible flux marks, loose solder balls or solder spatter on the accessible solder side of a PCBA.
When the contaminated surface is open to direct brush contact, a single-sided PCBA cleaning machine can apply a compatible cleaner and process the surface through controlled brushing and drying.
This route is intended for accessible surface contamination. Residue beneath low-standoff components or inside shielded areas may require a complete aqueous process or another validated cleaning method.
Reflowed assemblies may require cleaning when the flux process, product specification or downstream operation does not permit the remaining residue.
The decision depends on:
A complete aqueous process normally includes chemical washing, DI-water rinsing and controlled drying.
Flux residue, fingerprints, oils, salts and cleaning-agent residue can interfere with coating wetting or adhesion. The PCBA must also be sufficiently dry before coating.
Cleaning before conformal coating should be treated as a controlled process. The coating, flux, cleaning chemistry, rinsing method, drying conditions and cleanliness test must be evaluated together.
Manual brushing and wiping depend on operator pressure, chemical quantity, brush direction, wiping material and cleaning time.
Automatic PCB cleaning equipment is used when the manufacturer needs:
| DEZ machine | Workpiece and production problem | Cleaning process | Key data | Choose this machine when |
|---|---|---|---|---|
| DEZ-C753S Double-Sided PCB Cleaning Machine | Bare PCBs with dust, fibres and loose particles before solder paste printing | Three brushes, ionised air, dual vacuum extraction and front/rear sticky rollers | PCB: 50 × 50–350 × 350 mm; thickness: 0.4–3 mm; conveyor height: 900 ±25 mm; air: 0.4–0.5 MPa | Both sides of a bare PCB require dry cleaning before printing |
| DEZ-C758 Single-Sided PCBA Cleaning Machine | Visible flux marks and loose solder balls on one accessible solder side | Cleaner application, wet brushing, dry brushing and fan drying | PCBA width: 50–300 mm; component height: up to 135 mm; conveyor speed: 0.05–1.8 m/min; brush speed: 0–500 rpm | PCBAs after wave or selective soldering have an accessible contaminated surface |
| DEZ-C760 Automatic PCBA Brush Cleaning Machine | Repeated solder-side cleaning using controlled gripping and multidirectional brushing | Cleaner application, 360 mm rotary brush, two roller brushes and waste collection | PCBA: up to L300 × W300 mm; required board edge: at least 1.5 mm; conveyor speed: 0.05–1.8 m/min; spindle speed: 0–500 rpm | The board can be gripped safely and the solder side is compatible with direct brush cleaning |
| DEZ-C743 Offline Batch PCBA Cleaner | High-mix PCBAs requiring complete washing, rinsing and drying | Spray wash, DI-water rinse, filtration and hot-air drying in one chamber | Double-layer basket: 610 × 560 × 100 mm; maximum load: 10 kg; wash: 25–75°C; drying: up to 99°C | Different PCBA models must be processed in batches without installing a large inline system |
| DEZ-C1360 Inline PCBA Cleaning Machine | Continuous production requiring an aqueous cleaning process | Chemical spray washing, DI-water rinsing and two hot-air drying zones | Conveyor width: 500 mm; product width: 50–500 mm, customisable; product weight: below 10 kg; speed: 0–1000 mm/min; wash: 25–75°C | PCBAs must move continuously through washing, rinsing and drying |
The DEZ-C753S is an automatic inline bare PCB cleaning machine for the stage before solder paste printing.
Three brushes loosen particles from the upper and lower board surfaces. Ionised air reduces static attraction, dual vacuum sections remove released contamination, and front and rear sticky rollers collect remaining particles.
It is suitable when the problem is dry surface contamination. It does not remove post-solder flux residue or measure ionic cleanliness.
Use the DEZ-C753S when:
The DEZ-C758 and DEZ-C760 are brush-based PCBA cleaning machines. Both target an accessible solder-side surface rather than immersing or rinsing the complete assembly.
The PCBA travels continuously through cleaner application, wet brushing, dry brushing and fan drying. It supports boards from 50 to 300 mm wide and components up to 135 mm high.
The DEZ-C758 is suitable for visible residue and loose solder balls that the brushes can reach directly.
The PCBA can be held by the available board edge and moved through a rotary brush and two roller-brush stages.
The C760 supports PCBAs up to L300 × W300 mm and requires at least 1.5 mm of usable board edge. The main 360 mm rotary brush cleans the accessible solder side from multiple directions.
The DEZ-C743 is an offline batch PCB board washer for assembled boards. Multiple PCBAs are loaded into a double-layer basket and processed inside a sealed SUS304 chamber.
The process is:
Load → Spray Wash → DI-Water Rinse → Hot-Air Dry
It is suitable for:
“Offline” means stand-alone equipment. It does not mean that the wash, rinse and drying cycle is manual.
The DEZ-C1360 is an inline aqueous PCB cleaning machine for assembled boards.
PCBAs travel on a 500 mm-wide SUS316 mesh conveyor through:
Chemical Spray Wash → DI-Water Rinse → Two Hot-Air Drying Zones
The machine supports compatible products from 50 to 500 mm wide, with customisation available. Conveyor speed is adjustable up to 1000 mm/min.
Choose an inline cleaning system when:
Inline does not simply mean automatic. It means that assemblies move continuously through separate process sections.
A common production and forum question is why a board remains sticky or develops a white film after cleaning with isopropyl alcohol.
IPA can mobilise compatible flux residue, but the contaminated liquid must still be removed from the board. If it is brushed across the surface and then allowed to evaporate, dissolved or suspended material can be redistributed and deposited elsewhere.
The result can be:
The solution is not automatically to use more IPA. The process must consider flux compatibility, cleaning chemistry, mechanical action, removal of contaminated liquid, rinsing where required and complete drying.
For repeatable industrial production, this is one reason to replace uncontrolled wiping with a defined brush, batch or inline cleaning process.
Confirm whether the machine will process a bare PCB or an assembled PCBA.
Specify dust, fibres, flux residue, ionic contamination, fingerprints, solder balls, solder paste or another known contaminant. “Dirty PCB” is not enough for process selection.
Determine whether it is on:
Brush cleaning requires physical access and compatible component, lead and board-edge geometry.
Use batch cleaning for high-mix or changing production. Use inline cleaning when boards must pass continuously through separate wash, rinse and drying sections.
Visual cleanliness does not prove an ionic-contamination level.
Depending on the product requirement, evaluation may include:
Provide the manufacturer with the flux, solder paste, cleaning chemistry, component materials, coatings, labels and sensitive devices used on the assembly.
Global projects must confirm local:
A successful process must be verified against the reason for cleaning.
| Requirement | Suitable verification |
|---|---|
| Remove visible dust or fibres | Controlled visual inspection |
| Remove visible flux marks or solder balls | Magnified visual inspection |
| Control ionic contamination | Defined ionic-cleanliness test |
| Prepare a PCBA for coating | Cleanliness, dryness and coating-adhesion evaluation |
| Stabilise an automatic process | Recorded chemistry, time, temperature, pressure, speed and loading |
| Qualify a new machine | Sample testing using representative PCB or PCBA assemblies |
A before-and-after photograph can demonstrate visible change. It cannot establish an ionic-contamination value or guarantee long-term reliability.
Yes. Cleaning may be required when residue affects coating, inspection, appearance, high-impedance circuits or customer cleanliness requirements. “No-clean” does not mean that cleaning is prohibited or never necessary.
DI water is primarily used to rinse dissolved contamination and remaining cleaning agent after washing. It does not replace suitable cleaning chemistry when the flux is not water-soluble.
Choose batch cleaning for high-mix, small- to medium-volume production or frequent model changes. Choose inline cleaning when PCBAs must move continuously through washing, rinsing and drying.
Not reliably. Brush systems target accessible surfaces. Residue beneath low-standoff components requires a process with suitable chemistry, liquid access, rinsing and drying.
Send DEZ your board dimensions, contamination details, flux information, production volume and required cleaning result. Representative PCB and PCBA samples can be evaluated before the final machine configuration is selected.
